Question

what amount of heat must be supplied to
2x102 kg of Nitrogen at room temp. to
raise cite temp. by uso at constant
bressure. Molecular mases of nitrogen is 28 g
R = 8.3 J​

Answer 1

Mass of nitrogen, m=2.0×10−2kg=20g

Rise in temperature,   ΔT=45oC

Molecular mass of N2,M=28

Universal gas constant, R=8.3J/molK

Number of moles, n=m/M

=(2×10−2×103) / 28

=0.714

Molar specific heat at constant pressure for nitrogen, Cp = (7/2)R

=(7/2)×8.3

=29.05Jmol−1K−1

The total amount of heat to be supplied is given by the relation:

Q=nCP​ΔT

=0.714×29.05×45

=933.38J

Therefore, the amount of heat to be supplied is 933.38 J.

HOPE THIS HELPS